com.hazelcast.spi.partition

Interface IPartition

public interface IPartition

Represents a Partition. It is comparable to the Partition but it is optimized for SPI usage, so it exposes method not meant for regular Hazelcast users.

The IPartition provides access to information about a partition, most importantly the addresses of the replica's and this information will be updated. So one can cache the IPartition and keep asking for partition information.

Field Summary

Fields

Modifier and Type	Field and Description
static int	MAX_BACKUP_COUNT The maximum number of backups.

Method Summary

Modifier and Type	Method and Description
Address	getOwnerOrNull() Returns the address of the owner of this partition.
int	getPartitionId() Returns the partition ID.
Address	getReplicaAddress(int replicaIndex) Returns the address of the replica.
boolean	isLocal() Checks if the partition is local.
boolean	isMigrating() Checks if there currently is a migration going on in this partition.
boolean	isOwnerOrBackup(Address address) Checks if given address is owner of primary or backup of this partition.

Field Detail

MAX_BACKUP_COUNT

static final int MAX_BACKUP_COUNT

The maximum number of backups.

See Also:

Constant Field Values

Method Detail

isLocal

boolean isLocal()

Checks if the partition is local. A partition is local if and only if the getOwnerOrNull() returns the same address as 'this' address of the ClusterService.getThisAddress(). If the address is null or a different address, false is returned.

Returns:

true if local, false otherwise

Since:

3.5

getPartitionId

int getPartitionId()

Returns the partition ID.

The partition ID will be between 0 and partitionCount (exclusive).

Returns:

the ID of the partition

getOwnerOrNull

Address getOwnerOrNull()

Returns the address of the owner of this partition.

If no owner has been set yet, null is returned. So be careful with assuming that a non null value is returned.

The value could be stale when returned.

Returns:

the owner

isMigrating

boolean isMigrating()

Checks if there currently is a migration going on in this partition.

The returned value could be stale when it is returned.

Returns:

true if there is a migration going on, false otherwise

getReplicaAddress

Address getReplicaAddress(int replicaIndex)

Returns the address of the replica.

The owner has replica index 0.

The returned value could be null if the owner/replica has not yet been set.

The returned value could be stale when it is returned.

Parameters:

replicaIndex - the index of the replica

Returns:

the address of the replica

Throws:

ArrayIndexOutOfBoundsException - when replica index is out of bounds

isOwnerOrBackup

boolean isOwnerOrBackup(Address address)

Checks if given address is owner of primary or backup of this partition.

Parameters:

address - owner address

Returns:

true if address is owner or backup, false otherwise